The HA-507 is a pure analog headphone amplifier and preamplifier with no digital section, built to partner the UD-507 as the analog half of a separated headphone system or to drive a Reference 500 power amplifier as a line preamp. An extensive power supply gives it a rated balanced output of 6,700mW per channel into 32 ohms through 4-pin XLR and 4.4mm Pentaconn jacks, alongside 6.3mm and 3.5mm unbalanced outputs. Two balanced XLR and two unbalanced RCA inputs feed XLR and RCA preamp outputs.
